For me -
All of the GTA games - I found them pointless and especially after 3, unoriginal.
The Halo series - After being a die hard Quake/Doom/Unreal player, Halo just couldn't hold up to it.
Metal Gear Solid series - Thief called, it wants its ideas back
The F Zero series - Its just lost on me, maybe because Im not a racing fan?
Final Fantasy 7-9 - Really, I don't need to watch a movie every time I cast a spell.